1
linux/arch
Suresh Siddha de33c442ed x86 PAT: fix performance drop for glx, use UC minus for ioremap(), ioremap_nocache() and pci_mmap_page_range()
Use UC_MINUS for ioremap(), ioremap_nocache() instead of strong UC.
Once all the X drivers move to ioremap_wc(), we can go back to strong
UC semantics for ioremap() and ioremap_nocache().

To avoid attribute aliasing issues, pci_mmap_page_range() will also
use UC_MINUS for default non write-combining mapping request.

Next steps:
	a) change all the video drivers using ioremap() or ioremap_nocache()
	   and adding WC MTTR using mttr_add() to ioremap_wc()

	b) for strict usage, we can go back to strong uc semantics
	   for ioremap() and ioremap_nocache() after some grace period for
	   completing step-a.

	c) user level X server needs to use the appropriate method for setting
	   up WC mapping (like using resourceX_wc sysfs file instead of
	   adding MTRR for WC and using /dev/mem or resourceX under /sys)

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-04-30 23:15:35 +02:00
..
alpha alpha: use kbuild.h instead of macros in asm-offsets.c 2008-04-29 08:06:29 -07:00
arm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2008-04-30 08:45:48 -07:00
avr32 avr32: use kbuild.h macros instead of defining macros in asm-offsets.c 2008-04-29 08:06:29 -07:00
blackfin i2c: Convert most new-style drivers to use module aliasing 2008-04-29 23:11:40 +02:00
cris cris: use non-racy method for /proc/system_profile creation 2008-04-29 08:06:21 -07:00
frv Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2008-04-30 11:52:52 -07:00
h8300 h8300: use kbuild.h instead of defining macros in asm-offsets.c 2008-04-29 08:06:30 -07:00
ia64 tty: The big operations rework 2008-04-30 08:29:47 -07:00
m32r
m68k m68k: Export empty_zero_page for ZERO_PAGE usage in modules. 2008-04-29 08:11:12 -04:00
m68knommu m68k/m68kmmu: use kbuild.h instead of defining macros in asm-offsets.c 2008-04-29 08:06:30 -07:00
mips Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2008-04-30 11:52:52 -07:00
mn10300 mn10300: use kbuild.h instead of defining macros in asm-offsets.c 2008-04-29 08:06:30 -07:00
parisc parisc: use kbuild.h instead of defining macros in asm-offsets.c 2008-04-29 08:06:30 -07:00
powerpc Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2008-04-30 08:37:40 -07:00
ppc Basic braille screen reader support 2008-04-30 08:29:52 -07:00
s390 Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6 2008-04-30 08:38:30 -07:00
sh i2c: Convert most new-style drivers to use module aliasing 2008-04-29 23:11:40 +02:00
sparc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6 2008-04-30 08:46:16 -07:00
sparc64 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6 2008-04-30 08:46:16 -07:00
um proc: remove proc_root from drivers 2008-04-29 08:06:18 -07:00
v850 v850: use kbuild.h instead of defining macros in asm-offsets.c 2008-04-29 08:06:30 -07:00
x86 x86 PAT: fix performance drop for glx, use UC minus for ioremap(), ioremap_nocache() and pci_mmap_page_range() 2008-04-30 23:15:35 +02:00
xtensa xtensa: use kbuild.h macros instead of defining them in asm-offsets.c 2008-04-29 08:06:29 -07:00
.gitignore
Kconfig dma: add dma_*map*_attrs() interfaces 2008-04-29 08:06:11 -07:00